This is Perl module CGI::Header. INSTALLATION CGI::Header installation is straightforward. If your CPAN shell is set up, you should just be able to do % cpan CGI::Header Download it, unpack it, then build it as per the usual: % perl Makefile.PL % make && make test Then install it: % make install DOCUMENTATION CGI::Header documentation is available as in POD. So you can do: % perldoc CGI::Header to read the documentation online with your favorite pager. Ryo Anazawa